Roasting-furnace.



' PATENTED OCT. 6, 1903. C. H.' REPATH & P. E. MMARGY RUAISTING -PUENAGEL A'PPLmA'rIoN FILED 1101222, 1902. v No MODEL. 4 2 SHEETS-SHEET 1.

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A TTOHNEY PATBNTED ooT.s,19os.. c. H. RBPATH &'P. E. MARGY.

ROASTIYNG PURNACB.

APPLICATION FILED Nov. 22. 1902.

WITNESSES UNITED STATES Patented october e, i903.

4l-)n'rlenrr OFFICE.

CHARLES H. REPATH AND FRANK E. MARCY, OF ANACONDA, MONTANA.

RoAsTINc-FURNACE.

SPECIFICATION forming" part of Letters Patent No. 740,589, dated. October 6, 1903.

Application iiled November 22,1902.4 Serial No. 132.431.V (No model.)

T0 all whom t may concern:

Be it known that we, CHARLES H. REPATH and FRANK E. MARCY, citizens of the United States, residing at Anaconda, in the county `of Deerlodge and State of Montana, have invented certain new and useful Improvements in Roasting-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

Our invention has relation to improvements in roasting-furnaces; and it consists in the novel arrangement and combination of parts more fully set forth in the specification and pointed out in the claims. l

In the drawings, Figure l is a middle vertical section of the furnace. Fig. 2 is a transverse section taken in a plane above the bottom of the second hearth on the line 2 2 of Fig. 1. Fig. 3 is a top plan of the furnace. Fig. 4 is an enlarged sectional detail showing the stub-arm on the rotating shaft. Fig. 5 is an. eievational detail of the same, and Fig. 6 is a sectional detail showing the calcine-spout and special plow.

The object of our invention is to construct a combined reverberatory and turret furnace, the composite 'structure serving to combine the advantages of both types, while at the same time'it eliminates their disadvantages.

In the ordinary type of turret or McDougall' furnace there are enormous losses due to'iiuedust, a result which is inevitable from the expensive to run, both as to labor and fuel..

Our present invention eliminates both of the aforesaid objections, requiring, too, a minimum amount of repairs, entailing a minimum amount of labor and attention,and materially reducing the operating expenses.

While the present improvements are pref-` erably used in connection 'with the watercooled McDougall furnace, itis to be under- `its margin or outeredge.

steed that we de not limit their appneatien thereto, as they may be used on turret-furnaces generally. Where, however, the improvements are madea part of a water-cooled turret-furnace provided with removable stirring-teeth, the composite furnace thus produced results not only in an economy of space and fuel, but prevents loss of heat, and loss from Elue-dust, utilizing as fuel the sulfur contained in the sulfur-bearing ores,prevents overroasting of the line particles, admitting atmospheric oxygen directly with the h'o't gases, preventing overheating of the stirrers, and providing for the ready removal of the latter and other parts liable to be worn, without having to wait until the furnace cools.

In detail the invention may be described als follows:

Referring to the drawings, F represents the furnace, the same being provided with a series of superposed hearths 1 2 3 4 5 6, (the number may be varied,) through the center of which. passes the vertically-disposed hollow water-cooled stirring-shaft 7; The shaft is provided with a series of pairs of hollow radial arms 8, extending over the several hearths. In Fig. 1 the arms` onl alternate Yhearths are hidden from view, as they extend directly back of the shaft in the. position shown. The rake or stirrer teeth 9 are preferalolyv removable. Throughout the hollow shaft extends awater-pipe 1,0, provided with open-ended distributing-pipes 11, extending through each of the stirring-arms 8. The material is fed into the .uppermost hearth 1 through the hopper H and vby the action of the stirring-arms is carried toward the center, where it drops through upon the second hearth. At first the material is separated from the main body of the hearth-chambers by the annular shield 12, but issoon plowed out by the rake 13, which is fastened to the stub-arm 14. The armsl-t, as shown in -the draw-ings, are carried by the shaft 7 and disposed intermediate the bases of each pair of arms 8 over every hearth discharging from The material continues on its outward course, caused by the stirring-arms 8, and rakes 9, when it reaches the outer edge of the hearth where it drops to the third hearth through the several chutes roo 15 where again it is -fed to the center of the furnace, and soonV throughout the several well known and covered by Letters Patent,vr

and while our improvements ,are preferably applied to furnaces equipped as shown they may be applied to any furnace of the Mc- Dougall or turret type.

Referring now particularly to our improvements, as the material becomes heated and burns the gases are led over it and to the hearths above through the peripheral chambers D, said chambers spanning vertically two consecutive hearths, as best seen in Fig. 1, and being disposed on opposite sides of the furnace. The gases pass over the bridge or wall 16, taking an upward course through the opening 17 and impinging against the domeshaped orarched roof ofthe next hearth above, whence they are deflected upon the charge in said hearth like in a reverberatory furnace. The gases thus pass on from hearth to hearth, as indicated, through the chambers D, the gases being always on top of the material and never blown through it. This method causes a minimum amount of iuedust, produces an even roast, and results in a great economy of heat, (the sulfur in the charge contributing to the supplyof fuel.) To always keep the gases in this path and to stop the-gases from taking the opposite route of the material, interchangeable shields l2 are placed in the center of the hearths 2, 4, and 6, said shields surrounding and overlapping the lowerprojecting edges of the rings 18, located around the center openings 19 from the hearths above. These shields collectively form a complete cylinder, which can be put in place from the doors of the furnace by a special pair of tongs (not shown) which are hooked into the lugs 20. Then the shield is slipped between the lugs 2l 22 of the stirringarms, then over the stubarm 14 in the same way. The remaining three shields are put in place in the same way and all four firmly held by the two keys 23, passed through the extensions 14' of the'stub-arms. The gases are kept from taking the opposite route of the material on the outside of the hearths 3 and 5 by the stationary spouts or chutes 15,

which have inclosed sides and reach within a few inches from a line which coincides substantially with the bottom of the plows or rakes. This spout has the eect of keeping the gases out; yet the material comes down and is carried away by the special plow 24, Fig. 6. The top of this spout is located by al door 25, so, if necessary, it can be cleaned out or replaced with a new one. If desired,

this spout can be placed within the brick casing instead of'projecting intothe hearthcha'mbenV i- 1 To keep the-material from ever falling down alongside the vertical rotating shaft 7, it will be noticed that the ring 26 (located between hearths-'2,Y 3- and 4 5, respectively) projects above the-material on the hearth, and 'at the same time there is a flange 27, that extends out overth'e ring 26. The doors 23 are used to c lean or repair the chambers D, at the same time aording a means of admitting the hrequired amount of atmospheric oxygen.

We may of course qualify the present construction in minor details Without in anywise affecting the nature or spirit of our invention.

By disposing'the chambers D on opposite' sides of the furnace the gases of course take the most available route (see arrows, Fig. 1) to insure the best results in theV matter of roasting, saving of fuel, the.

Having described our/invention', what WeY claim is- 1. In a furnace having'a'plurality o f verti- K cally-disposed hearths, peripheral chambers.A establishing communication between the seV- eral hearths, a central vertical stirring-shaft,

in said hearths, a series of stirring-arms radiating from said shaft and extending into the several hearths, spouts or chutesfleading' from and extending a suitable distance be-.

yond the margins of an alternate series of hearths to the series immediately beneath for permitting the descent of the material, yet

excluding the gases, and special rakescarried by the stirring-arms for removing the material delivered through the spouts, substan-j tially as set forth. Y

2. In afurnace havinga plurality of hearths, a rotatable shaft passing through the hearths,V

a series of arms radiating from said shaftand shaft, a rake carried by said stub-arm, the

said rake serving to remove the material fed from the hearth above through anopening surrounding the shaft, substantially as set forth. i

4. In a furnace having a series of hearths,'V a central rotatable shaft passing through the hearths, a series of arms radiating fromfsaid shaft and entering the several hearths, 'lugs formed at the bases of the arms, stub-arms disposed on the shaft between the arms,n a se*- ries of sectional shields adapted to be insert ed between the lugs and be supported on the' stub-arms, and keys for locking the sections, the latter forming a complete ring or cylin- 'a position immediately below the dischargeopening surrounding the shaft and leading n.frorn the hearth above, substantially as set forth.

5. In a furnace having a plurality of hearths, a series discharging from the center into the remaining hearths, and the latter discharging from their outer margins into the former,

. and speuts leadingland projecting a suitable distance into the centrally-discharging series from the hearths feeding into them, substantially as set forth.

6. In a furnace, a rotatable shaft, a series of stirring-arms carrying teeth or rakes, ra diating from said shaft, and stub-arms having teeth, located between the radiating arms, substantially as set forth.

7. A roasting-furnace having superposed hearths apertured for the passage of the ore, and means for crowding the ore toward the apertures, in combination with stationary spouts extending between the hearths and der when assembled, said cylinder occupying adapted to direct the ore on its way from one hearth to the next hearth below in such a manner as to protect the ore from the influ- .ence 0f the draft, snbstantiallyas set forth.

8. A roasting-furnace comprising superi posed hearths apertured alternately at the Witnesses:

M. E. RU'rLEDGE, M. C. STANSFIELD. 

